#!usr/bin/env python 

stack = [] 

def pushit():
	stack.append(raw_input(' Enter New string: ').strip())

def popit():
	if len(stack) == 0:
		print 'Cannot pop from an empty stack!' 
	else:
		print 'Removed [', `stack.pop()`, ']'

def viewstack():
	print stack 

CMDs = {'u': pushit, 'o': popit, 'v':viewstack}


def showmenu():
	pr="""
p(U)sh 
p(O)p
(V)iew
(Q)uit

Enter choice: """
	while True:
		while True:
			try:
				choice = raw_input(pr).strip()[0].lower()
			except (EOFError, KeyboardInterrupt, IndexError): 
				choice = 'q' 

			print '\nYou picked: [%s]' % choice 
			if choice not in 'uovq':
				print 'Invalid option, tray again'
			else:
				break 

		if choice == 'q':
			break 
		CMDs[choice]()

if __name__ == '__main__':
	showmenu()
